This small voltage regulator was found in a 1969 EEE. More powerful transistors can be used to obtain a higher output current.
In the figure we have an oscillator circuit by Wien Bridge (Wien Bridge Oscillator). The frequency of...
We found this circuit in an old English publication. The sensor is a common LDR. and the...
This timer can control loads up to 240 W. We found it in a 1967 RCA documentation. The main...